As for Obama, he’s irrelevant.
I wish that were the case. Unfortunately, in this situation his administration is dealing the cards from the American side -- even though he's got all the credibility and moral authority of a cockroach.
When you decide, as he has publicly stated, to lead from behind, when you draw lines in the sand and do nothing when those lines are crossed, you become irrelevant as the leader of the free world. Putin is taking advantage of Europe’s naive hopes and Obama’s ignorance.